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Anatomy of The Lumbar Back Muscles-External Oblique

The external oblique originates from the inferior border and outer surfaces of the lower eight ribs. It interdigitates with the serratus anterior and latissimus dorsi, with upper, middle, and lower attachments. The upper and middle fibers attach into the abdominal aponeurosis.

The posterior attachments descend to insert on the anterior half of the iliac crest. Rizk  and Lee  have described the external oblique as being bilaminar, with the two layers blending with the fascia of the opposite side and the contralateral internal oblique. The external oblique muscle has been identified as part of the global stabilizing system.

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